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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9caeb0b7e2da555fe7fccb1aa29743816d3e8c4c0d2bb639bdad5e97808d787' 
  AND token = 'VGaZK3dH2AGMVXidDUJVX/ZbHgiMK3/E3PzgNQe6RJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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