SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac271ef24a73de2ecdd8b5d6893b2285805343d761157bae80f224774552c96a' 
  AND token = 'Iq9m+wOlqPM28DnAvYq6FtZ6pSgTDnZyIjCz0mYUZwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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