SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7558d54b39ce5d17227ed86114c8fd8575e3324d34efa236901113f0612ac763' 
  AND token = 'DhdsUTtSz3lcZLsT0K2f1lB2XJPGNZjY/8CRzo6+5XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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