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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e0d933fd9afd017d6803d0ed465bd1f7996052bea8e7243cd35d52f8c35d06' 
  AND token = 'DhtZV7eioGnsvQmrj9mm5GnU8WCjrwqktOiWhn6Y34Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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