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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756514043c43a01b981ca577de938d58e38dc55fbb365b52ec0205435e3b72c0' 
  AND token = 'hP0/NXQ9i3M+OEFzsFxhqSjlGZj4T1rGa3DqlXTCe+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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