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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a31423c951dd8ece9dfc2e5f4d12d62b8134f4452ce74f444c25cb82501f5b8' 
  AND token = 'DZcyL701j5X3kLKDtsw+aefOQulubR1l/D9HHwIsy6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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