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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fccc7b9cdb923d15a43cd13d64b9cd872b0317d971c621dc4f113d765dddce5' 
  AND token = 'xbc9e1HrL6ilgMVngPqFEIuh0ggKP77a3vYhmfrt63o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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