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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d3d0906c6b5dac341d4b3feed4e7185c2fab688215e2b1f44e038177042a52' 
  AND token = 'jJN77w5kTIx9Xw6I7DxooF7o/nJJ+yOmtPl0reCLnKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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