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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9371fef5be6050a13408c373cd82ee7a6b0d162ddd1442a5477add50ca1b8ef' 
  AND token = 'ha9+3viS5xAcJ5V77T3NpOOHlWDOT7/FLCDiFFweOR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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