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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326b2d8de1b1ca5702ef045658894f6e07693eb309d781efe6ece793657b658f' 
  AND token = 'sa9+p8fZZwbKq2uro8psHSZug7PGG9PBZ38iFXgKaws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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