SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b2cd56ec23f931cff1b74f5f97ffec8b8a06835e73559534f7dbb72f82b057' 
  AND token = 'zuZWPbsBKxJArGp2l608IGMvuyMpNR5/pguHEe4Rnw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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