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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85568fb1aae7d589aa218f4791e479c991d5cd041c75855900f57b1d3026cabe' 
  AND token = 'b8Z7K3Dw1Ou3unaYLZF6n1hpQXWMz/pGuFGIL9llfp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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