SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238b4de069de6272792c8b1ad59a69f6de1feaa94a016532e711c4b6a3ebb7f0' 
  AND token = 'oGtBjJZWv4sC4czOwxPEzKGgbl85xqEKpv9nebsXVog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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