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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8a250ad26f0f4f6f118a383f0f3274d0a3351dd5e288aff13fc6fd960da60b' 
  AND token = 'X93AIdTzkei5MSPk4QnxXfQ/72UejVhv5DSHwNowc0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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