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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe34b152e4fdbe861f2ef7257417f93a4febe51b21d9e64a8d3c3dd30d11a27c' 
  AND token = '5hKcW62a4OEtMQNIVtX9vzzdTr8ZeABVifC5//MLwlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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