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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdc155c9d94348f3f5a77b8f0b974df40255009fa3427006384d39248ddfc6b' 
  AND token = '4GrgM7fz2TXR0RMXXuzfnRG+kUaT2pRlu6GFaY00nps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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