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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c070d08db4deb8bd4e6d0dfb4bfab60f67d572eeeb222f89eee69a3386b9df' 
  AND token = '3D3xc4DMqQGfQKgAzVEsKsaP5YLcOPpasIOsmuS03r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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