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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7771bc5a55cb135963989620b05b0a0027e94e8517a9eb8837a51ad9b1411617' 
  AND token = '9GmiNWt0rm0ZB3frkBwQ3vMCjhsqLlO0ZYWcjAyIMvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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