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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93889f3b316257f6c5e2141016b95c175d30ad348d1f0aecc1f6386cab96d06f' 
  AND token = 'iMr9KQ3icnMFxg7Zk5MM7Key+uZnbXH9fiC6FKf5vVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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