SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b967a040cd24986ee6d624197415bf02868fcc43512fffd5d3c90d74ea7f1e8e' 
  AND token = 'yQz+9EtkF2BmdWg5SbfVxMpOFHZAP2XTqDNbLl/OuvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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