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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a683518d0c46525c546e842cf332c4447d937b588d7695415809de7f9b757cb8' 
  AND token = 'SSIIZOazMhD8zGy1Nu4JVXREj0xq3qZR4gEV8qrTB2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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