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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a78fa085c0198f62cc3d696cc6ab979fa06ec035657e2ba5eb81ebfe978f09e7' 
  AND token = 'zd9eovGOdCiVRI5ckGSkT+LyJNLbPVvX8JH8FQ8uk9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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