SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e076ceadbba06b074e55c1fe73b2801f190c9c3382c55d173023c6349379004a' 
  AND token = 'J1xK9q2ToBUzX/IgwvXZLgOK1pKtLsCAsBQ2DLTPwoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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