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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe92b4a82e03b23f245db3c12d452583819e09c39d4241eb0e75d5bae1a01a96' 
  AND token = 'anXrpr0Jufe2Dg3/ALmOOuCegIQdLknHWBZsATnOE00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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