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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2484507cc83e5b1e5970dc1a147c5f6338ae4379678ff68edf99b1efbf47a592' 
  AND token = 'C1WEBuy97ehQyz6A5M1/ZiS8YtAEoEwJebNyVQZO8XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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