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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d5dcd02a309f26e08556290c8586f10c6a83894f39b5c320065235a3338550' 
  AND token = 'IQQgnzQs/8WavPkZ2NCiUNLOtZ5k+dCLwe3ev8+ZaAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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