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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38055d71342d93fc950a2fbf3ed2f028d75e62537e81a3b05aeb96610ee1ee4' 
  AND token = 'qnvSlWoMgtvHtRWM6Zu16JjvDyyfao7Fq3eFkhNimqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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