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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1544079a4493571e2cdb23f7e185caaeb1589b68c68421e8fa03ef87bd6654' 
  AND token = 'rDyEKrxGf5T5QI4Gp+Gl9UZN4OnzI/W2gtDcc7AGW1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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