SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb3db87f4f3a2c49845fc90d6f44c8d67e7dbd5c856a82d6f49b5d68aa804f9' 
  AND token = 'BvKba/BN9hAZFdtSQo/KP5l/mrBKlFVdET7M3wjuGG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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