SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a36d74c8975364cd2c4f3115bdf212f12bb91235a0159484c3eb1b3bdaf55c' 
  AND token = 'P0BfR7mKe7PglFHTg04DGLtzUjx7XIQjQ/loYlAJVj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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