SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb20d32942d1fef752b919ed049f2939f38b15cd0163395ee468b0836346a8cf' 
  AND token = 'xMs8z1uBo+sLe7sSknVvPxUt9TzkVlOKky7YKTSUZmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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