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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b03848ea7eb76083b8c6f087bdcb6120fe6cce0303709b3a9c667190c34468' 
  AND token = '8k6LJtnuB/WCOD8WOBrfVc04InYY5WJYL6qAMaeWxSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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