SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1cfab7424279c801c92df2a47b11b6f716cc5caa1300201bae9daadd83f570' 
  AND token = 'HQLhBOv+gjDfTMCgt/DvMGQOAobMyP1IQJYJ+ZP+t+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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