SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1811d052d01f4c71e7e91a6f1d8a6b963f9c646677b207c31af30b77453696cb' 
  AND token = 'i0lNZJ+k+xwzm54lmBbmN2HxPI/PAhlesJU2VKlV3a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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