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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63836106ecb5d83138c579ce541559d4b2fe7e837186c90bbd0537630e3187bc' 
  AND token = 'RZ8DmD5LMncLQ0yj2FZPg8w2g9MjthV3OZaQp7DjitE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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