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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26e049f4b1a086461765ba803017e02e63b6dade0520adb0151699d329e93fa' 
  AND token = 'uBi3bZGE3WSt6o3lU4OJZnXBHYgf9d2GDQlWb+XFevY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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