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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21e1c6e2167b65af0b16319cefc908765982e1176e7ed1044557ca7879524974' 
  AND token = 'aY6qZIBOeTit2Jdk1Mk/asnjtEvigD5DbxGhI3NH2bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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