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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d17ba46c76e35382d0fb129507cbf1cb6da60cb6cefdbda19b5e5de1fc5cd7' 
  AND token = 'G3dgE1ZyDIxNvmhcTgsXUFeNJxf5X0yFnO+kxcDjLAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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