SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ca392acf6d191f8d4c74be6922fcb6ac8de956c0fbb62e318387fb7dda2784' 
  AND token = 'NYbYQ2pMhqa4GwcVOeI5bsrm/IBK+tXiP9U/BxAZYrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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