SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83f631f9493247e078d442ec5bfe885aa31f19a67b7b2232fc9c5a9124ea9d8' 
  AND token = 'HzUBoXkT6bdbDILdqr/ueHqKl3SpUlKIn+DG/eGnfMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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