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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd02d27e51dd8b2e86e4522b53114c130166930ac75d31a21659080a96e9db51' 
  AND token = 'jcU/2tMcmSzywnbVhAjZcQNhPCZ/7MRVjUFl7P/ECag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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