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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e91b8660aadca80cdbdbcf9a56d88cdc1cfb4d2f13ede8e62ef0c174d4d04a' 
  AND token = 'tp8AldoSgKbiX5ZlyBkz9I7Yi+K2gKEymfNbWCmq7t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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