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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6dff4c0c8e1bc43dcea03dc668ca87657412dfc5b93f34a17ef7ed89069600' 
  AND token = '1qbVL9GEl337UcZXqMqG7Pd2Dr3GwsG1Cpflu1V+DbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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