SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ce0435977f512244cd19538a853702db9066034a34d9f65f5def2e3768d18f' 
  AND token = 'tmjQXYVVEDwGpqvgP5aWD2VqDF/SDNCHoPPnGNZFAlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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