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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ef13720b172ed66e266e69e26bdc928347bbb7bd0880f3cab39aba4903b3bf' 
  AND token = '4GeqimuyFQxlWd5LZ1SfL1oGQ+97rN15gWjdpmF8NdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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