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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe743beef209513f9142926add2c9bb73fcff65e22d1608b08851cf6ec981c5' 
  AND token = 'bryQg5gW1z7SgoKmHgOVFd9Svrf5izrgy7G8w0bHrFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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