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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2ddd9719c33a54cbda3b2f0c899302859ea56f79dffefe4f216808ac0e9b70' 
  AND token = '5vE2piJCSduR+Dno7j3fkxvsLMnvU+Mbo3N7USUDSYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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