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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4facfd0e89aaa52085bfd26883e17983ddd21e347467772f4717808030fdf4' 
  AND token = 'nd30Xy0ACu+KOd/uaF0bVxKc8fW5OkAx0Z4PL/PJtnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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