SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c746c8710e7637e36b23d92a1d73d2f6743d261072b8c9ee11da76d41325ba7' 
  AND token = 'Ujo7KeorD9L9+m/fwQA8EIV+qCSnE/UZKShuJg9NzeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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