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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9134c1c0e223b26140229b7c6170ac68872db18698b5038bae4452f18fc9e4' 
  AND token = 'vnVX0BcQAYqKt4l1wm4fwBoYafqe2fBzvi5Yg1NluE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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