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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a1b7405d4536966ce4ce6e886b3cba1f723bb86b8b4b731ec23064c3186cb6' 
  AND token = 'NPxh0etOyJ8aTgBaTepVENcwNZsU5pMuOKhkr9EQL5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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