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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dab24d2ad8c392bcc6e40a099434af77e3c171b6458d27837a251d6106025f' 
  AND token = 'jzI+T2sxMymXlGp8cule1bW3Lh8njaAdLw4ItLK3LgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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