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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eaef6ce5de0081290d3dd38e8dc69591e8398e7f74ce65e2f96b2bab14ea36f' 
  AND token = 'te8r2l/foIphO0yQbWCygZ/7csct+5kMVv0Tp3aWo0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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