SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd1aaf04fd2dfb36f6350fe16e56849f7bb0e9c92e6260951d9db58df4eea58' 
  AND token = 'bMuYgY08o1SJLVuGyj+hhrprJFU3oHKpYj2LqJy0sIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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