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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9c6b9cce6626828c063fe679475e696e2076b5fc9e494786c33ee8d73dce88' 
  AND token = 'kETF3+ynWUWLoa1g9aIJwipzz/VDxFweDp72B/Q9KbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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