SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f42c453b61a274de0fbbffff86e9a25ea8394c667ffdca013b1595d9704f0e' 
  AND token = 'DCYNy6SDGuHt0OSvpSNkFzTVF52ZndX/zUAKBxMymPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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