SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70c06b8944e5f98f91965920ef72587b38b1fb6d97ecec9b19f3bcbda73d00a' 
  AND token = 'KYuTf5pWmOTQOuT3/jZ+KZ2pg/hQM53s7Optvfp+1wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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