SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f99a4eb54fc72feec3aaa851f00d8a40f2648134f6b171010a654c8d62c7f4b' 
  AND token = 'D0pgTr1lZwvyRxmhgzuizP13+C6DnjwjqRfSBhWnstE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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