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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cd37d04d40e312d444be850272a826f0bba7dd0fcd6e57688f35c4bb2800da' 
  AND token = 'xXpeX2Y/bIYOkepoBK5E2xkTp0O7WBRyD64b34WTEbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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