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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c253809ac2bbadf625d0ea7ee7ed4d6038fcfdb0c31ddfd658e1b072b94618' 
  AND token = '00iqd3C80L3tCZSyvaQZ4JVGEWopGPsPwuiCA7xNLIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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