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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef01e05e6b22006f1a578bb14b5498752e0f1c65c9a59a08c376c41215a84827' 
  AND token = 'Pu0qHGkYu0rkY2+86ewiClE8/VI+dnQufVC1hOEwH2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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