SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c45fbcdc2dc5356e9680725931d427f1b0e17fa28e8036e482078258b716f3' 
  AND token = 'SAx9FVYLFtJiGI/OWa+MXoisZkQcrGekvgh+TvMOVQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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