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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3abdf8398525518121dcb15e3b9c7821fb9a3789a73f490735ba30ae4e0992' 
  AND token = 'GZFjJ1C45BtN3pd2Ms6s5s0yYdMQVSmscAaDsbE9Kt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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