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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a510fd57c7926eca98b82c7ddd147ac317981edfec73ee056ecc37e623716fc' 
  AND token = 'IhzvqhJZTSCBCuHcLToNUaqOeXi8cr9kwr6crjXl4yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}