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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30fea619a34be88457300034c9da31c48cf424e123edfb1c646489b003b7230' 
  AND token = 'hNW8co2ISpDpSlQTbLBbTb4hGBVVSmYR3obsSiwodX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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