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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d4c58531f9266c62054dfcf35cf5a7d4f6a425e202ed86502fef726a55fd33' 
  AND token = 'RgQ14xsQTYmPEC4YTAfRu5lZDXo9QZIRAjTK4HLD1gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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